下列组合中,属于含有极性键的非极性分子的是 ( ) A.C2H4、C2H2、CO 发布时间:2017-07-17 13:16 │ 来源:www.tikuol.com 题型:选择题 问题: 下列组合中,属于含有极性键的非极性分子的是 ( )A.C2H4、C2H2、CO2B.CH4、CHCl3、CO2C.Cl2、H2、N2D.NH3、H2O、SO2
题型:选择题 选择方框中适当的选项补全对话 (P - Policeman F- Frank)P: 1 F:Yes, please. I'm looking for my little sister. P: 2 F: She is short and has short curly hair. P: 3 F: Yes, with thick glasses. P: 4 F: You're right. P: Oh! Look! 5 F: Thank you. P: You're welcome.A. Dose she wear glasses? B. She's under the tree over there. C. Can I help you? D. What does she look like? E. Is she a little bit heavy? 查看答案
题型:选择题 一种调料的原材料有五种:F,C,H,J,K,配方可以是其中两种或两种以上的原材料混合在一起.但须遵守下列的规则:有F必有H,且l份F必有B份H;有G必有J,且G、J等量;H和J不共用J和K不共用;有K,且K的量比其他所有的量都大;下面哪一个是可以接受的配方A.一份F,一份KB.两份G,两份F C.三份H,三份FD.四份J,四份G 查看答案